package org.example.jdbc;

import javax.sound.midi.spi.SoundbankReader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;

/**
 * 修改密码功能;
 * 程序运行之后，终端提示：
 *  请输入用户名：
 *  请输入新密码：
 *  结果：修改密码成功 | 该用户不存在
 */
public class Demo02JDBC {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        Class.forName("com.mysql.cj.jdbc.Driver");
        //DriverManager.getConnection().var + 回车 + 回车;
        Connection connection = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/tedu?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true",
                "root",
                "root"
        );
        //connection.createStatement().var + 回车 + 回车;
        Statement statement = connection.createStatement();
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入用户名：");
        String username = scanner.nextLine();
        System.out.println("请输入新密码：");
        String password = scanner.nextLine();
        //executeUpdate():返回的是受影响的数据条数;
        int i = statement.executeUpdate("UPDATE user SET password = '"+password+"' WHERE username = '"+username+"'");
        if (i > 0 ){
            System.out.println("修改密码成功");
        }else{
            System.out.println("该用户不存在！");
        }
        connection.close();
    }
}